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Samantha Lewthwaite, a British woman whose husband was one of those who attacked London in 2005, isn't being hunted for her rumored connection to this week's attack in Nairobi. She's wanted for another alleged plot from 2011. But witnesses have said a "white woman" was involved in the Kenyan attack.

The towering sequoias only grow on the western slopes of the Sierra Nevada and are among the most ancient living things on Earth.

So far this year, there have been shortages of more than 200 drugs, including treatments for cancer and high blood pressure. Cancer drugs have been hit the worst, and an analysis estimates 550,000 patients in the U.S. have been affected.

Public health officials say the evidence is solid that fluoridated drinking water helps protect teeth. But that hasn't stopped opponents from lobbying local governments against the practice.

But the credit rating agency warned that if the country doesn't curb its debt, it could face a downgrade.

Washington Nationals catcher Wilson Ramos' kidnapping had a storybook finish when commandos rescued him just two days after he was abducted. But others aren't so lucky. It's not uncommon for hostages to die in Venezuela, and the usual path to freedom involves paying a big ransom.

Ever wanted to have a dish named after you? We found the secret! Sort of. This week's guest is an experimental chef who faces off with a fellow foodie in our most appetizing challenge yet.

Heriberto Lazcano, "The Executioner," was reportedly killed Sunday in a battle with Mexican marines. Salvador Alfonso Martinez Escobedo, known as "Squirrel," was captured hours earlier.

It's been a tough week for daredevils. Felix Baumgartner had to postpone his bid to break the speed of sound during a skydive. Chris Todd had to give up his hamster-wheeling walk across the Irish Sea. His machine sank.

A Swiss foundation claims to have evidence of an earlier version. Skeptics say they need more proof.